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Method for detecting influence of electron beam irradiation on free radical concentration of coal by virtue of electron paramagnetic resonance

A technology of electron paramagnetic resonance and electron beam irradiation, which is applied in the direction of analysis by electron paramagnetic resonance, and can solve the problems of research on the change of free radicals in coal samples.

Inactive Publication Date: 2013-12-25
SHANGHAI UNIV
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Problems solved by technology

So far, with regard to the paramagnetic resonance research of coal, the purpose of domestic and foreign authors' research is mainly to explore the relationship between the paramagnetic resonance characteristics and the degree of coalification or the maturity of organic matter, and there is no systematic study on the changes of free radicals in coal samples after irradiation. Research

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  • Method for detecting influence of electron beam irradiation on free radical concentration of coal by virtue of electron paramagnetic resonance
  • Method for detecting influence of electron beam irradiation on free radical concentration of coal by virtue of electron paramagnetic resonance

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Embodiment

[0021] The steps of this embodiment are as follows:

[0022] (1) Pretreatment of coal samples: First, the coal particles are ground to below 20 μm, then washed with 1 M NaOH solution, and filtered to remove the original oil in the coal. The washed coal sample was dried to constant weight under vacuum at 393 K to obtain dry coal powder, which was sealed and packed in bags.

[0023] (2) Electron beam irradiation on coal samples: use the GJ-2-II high-frequency high-voltage electron accelerator provided by the Institute of Radiation Application of Shanghai University to irradiate the coal samples that have been pretreated in step a, and obtain doses of 10 kGy, 20 kGy, 30 kGy, 40 kGy, 50 kGy coal samples.

[0024] (3) Carry out ESR test on coal samples before and after electron beam irradiation: Accurately weigh 15 mg of sample, put it into a sample tube, and obtain line width, line shape, g factor, hyperfine coupling and spin concentration, etc. through ESR test Spectral ...

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Abstract

The invention relates to a method for detecting the influence of electron beam irradiation on free radical concentration of coal by virtue of electron paramagnetic resonance. The method comprises the following experiment steps: (1) carrying out pretreatment on a coal sample; (2) irradiating the coal sample by electron beams of different doses; and (3) carrying out ESR (electron spin resonance) analysis on the coal sample before and after electron beam irradiation. By carrying out electron beam irradiation on the coal sample subjected to pretreatment, the coal sample with different irradiation doses can be obtained by controlling an electron accelerator. Then, analysis on Lande g factor, free radical concentration Ng, peak width delta H and peak height Hpp is carried out on the coal sample before and after electron beam irradiation so as to research the change of a coal structure. The method has the advantages that the operation is relatively simple and easy to master, the change of the free radical concentration of the coal can be measured in short time, and a good dose effect relation can be achieved, thereby laying a foundation for further research on a coal macromolecular structure.

Description

technical field [0001] The invention relates to a method for detecting the influence of electron beam irradiation on the concentration of coal free radicals by using electron paramagnetic resonance, which is helpful for further studying the structure of coal macromolecules, processing the coal, and increasing the yield. Background technique [0002] Continuous differentiation and interpenetration is a remarkable feature of today's science, especially the development of chemistry, and many emerging interdisciplinary subjects have emerged from this. Polymer radiation chemistry is the intersection field of polymer chemistry and radiation chemistry. Polymer chemistry studies the formation, structure and transformation of polymers; radiation chemistry studies various chemical changes caused by the interaction between ionizing radiation and matter. Therefore, polymer radiation chemistry is to study the chemical changes and effects of the interaction between ionizing radiation and...

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Application Information

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IPC IPC(8): G01N24/10
Inventor 刘艳兰印仁和陆黎明
Owner SHANGHAI UNIV
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